Staff Sgt. Douglas Felter, right, a combat engineer and observer coach/trainer assigned to 1st Battalion, 409th Brigade Engineer Battalion, 4th Cavalry Multi-Functional Training Brigade, instructs a soldier assigned to 396th Engineer Company, Mobility Augmentation Company, how to use a time delayed detonator for a C4 explosive charge during Combat Support Training Exercise 86-17-02 Aug. 17, 2017, on Fort McCoy, Wis. CSTX is a 181st Infantry Brigade led, 4th Cavalry Multi-Functional Training Brigade supported exercise designed to assist combat-service and combat-service-support units in planning, preparing, supervising and executing of pre-mobilization collective training.
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